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Grinding Of Silica Sand To Silica Flour

Jan 01 2020nbsp018332Silica grinding that is performed in connection with sand gravel or clay digging shall be classified as 40001 Sand or Gravel Digging if 25 or less of the excavated material is crushed or ground If more than 25 of the excavated material is crushed or ground all crushing and grinding activities shall be classified as 17411 or 1710

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